CHAPTER 5 - COMPUTER VIRUSERS & MALWARE.pptx

COMPUTER VIRUSES

1. Computer Virus & MALWARE A thug for computer

2. What is a computer virus ?? A type of malicious software program ("malware") Replicates itself by modifying other computer programs Written to alter the way a computer operates Designed to spread from one computer to another.  Destructive programs that delete or corrupt files Interfere with computer operations 2

3. Symptoms of Computer Viruses Slower Internet and Processing. ... Unexpected Computer Behavior. ... Sudden Freezes & Crashes. ... Error Messages. ... Advertisements. ... Outgoing Emails. ... Missing or Extra Files. ... Hardware and Accessory Problems. 3

4. Types of Major computer Viruses Boot Virus Program Virus Micro Virus 4

5. Boot Virus A type of virus that infects the boot sector of floppy disks Also infects the MasterBoot  Record (MBR) of hard disks    Hides in the boot code for a media device, such as a disk Runs automatically when the media is loaded 5

6. Program Virus They are often called Trojan Horse Virus  They hide in an apparently useful program Then run when the program is opened. Can travel on media like a CD by by  email attachment. 6

7. Macro Virus Computer virus that "infects" a Microsoft Word or similar application Causes a sequence of actions to be performed automatically when the application is started Macro viruses tend to be surprising but relatively harmless. 7

8. Some minor Computer Viruses File infector viruses Multipartite viruses 8

9. File infector viruses File infector viruses infect program files normally infect executable code, such as .com and .exe files. infect other files when an infected program is run Many of these viruses are memory resident. Examples :Jerusalem and Cascade. 9

10. Multipartite viruses Multipartite (also known as polypartite ) viruses Infect both boot records and program files These are particularly difficult to repair. The same holds true for cleaning infected files. Examples : One_Half , Emperor, Anthrax and Tequilla . 10

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12. How Do Computer Viruses Spread? Computer viruses usually spread in one of three ways:- From Removable media. From Downloads off the Internet. From e-mail attachments.

13. Malware

14. What is malware? Malware is a malicious software that gets installed in your device and performs unwanted tasks. Mainly designed to transmit information about your web browsing habits to the third party

15. Types of Malware Viruses Trojan Horse Spyware Spam Adware Rootkits Scareware Worms

16. Viruses Software that replicates itself and spreads by damaging and deleting the files. Virus enters your device via attached images, greeting, audio/video files , downloads etc.

17. Spyware Spyware is a program that gets installed without the user’s permission. It monitors the user’s activities on the internet and transmits that information to the third party.

18. Adware Software where advertising banners are displayed while any program is running. It automatically downloads to your device while browsing any website It is used by companies for marketing purposes

19. Scareware Software that is designed to trick the user into buying or downloading unwanted software.

20. Worms Malicious program that make copies of itself on local device, network shares etc. They make the working of your device slower.

21. Trojan Horse A Trojan Horse is a program containing malicious or harmful code. Entering a computer, it performs various tasks like corrupting files and sending out personal information.

22. Spam Method of flooding the internet with the copies of the same message It is for the purpose of advertising, phishing, spreading malware etc.

23. Rootkits Software hidden deep inside your device which remains undetected. It transmits all your sensitive information

24. Preventions against viruses Install Anti-Virus/Malware Software. Keep Your Anti-Virus Software Up to Date Keep Your Operating System Current.  Secure Your Network. Think Before You Click.  Keep Your Personal Information Safe.  Don’t Use Open Wi-Fi. Back Up Your Files Use Multiple Strong Passwords 12

25. Anti-Virus  Computer software used to prevent, detect and remove malicious software  Provides signature-based detection of malware May also prevent spyware and adware, along with malicious programs 13

26. Basic Functions Of anti-virus Scanning directories or specific files for known malicious patterns Allowing users to schedule scans so they run automatically Allowing users to initiate new scans at any time; and Removing any malicious software it detects. 14

27. Difference Between Paid and free anti-virus Free antivirus software generally only searches your computer using signature-based detection . Paid antivirus software will usually also include heuristics to catch new, or zero-day threats. 15

28. Some anti-viruses 16

29. Conclusion In the context of the world the computer viruses are the bad who distract the life of the normal people. And to stop them anti-viruses are created Anti-viruses are the police in our nation who protect us 17

30. THANK YOU 20